dont think it really matters, I'd go with whatever you're comfortable with. just as long as the grip is secure. idk if hook gripping is great for pl stuff, pretty much mandatory for OL to keep the arms loose to get a better pull and turnover. also weighted planks are pretty awesome. did some w/ 65 kg the other day and it was pure fucking torture from second 1 onwards. my coach regularly prescribes shitloads of front squats for anyone asking for ab work.